基于光学基准法提高倾斜船台上惯性平台水平测量精度

Improving level measurement precision of inertial platform on inclined ship-berth based on optical benchmark

惯性平台安装在舰船的过程中需要将惯性平台坐标系与舰船坐标系进行对准,也就是对惯性平台进行标校。当舰船在倾斜船台上进行建造时,由船台的倾斜角度造成水平测量仪器的测量误差对标校的结果有很大影响,尤其是在测量舰船横摇角时,会由于测量仪器的摆放带来误差。为了提高倾斜船台上惯性平台的水平测量精度,在电子水平仪上设置光学基准,并通过高精度自准直经纬仪(TM5100A)对放置在基准平板及惯性平台上的电子水平仪进行方位对齐,保证其测量方位的一致性。实测结果表明:电子水平仪方位的对齐误差为2″,电子水平仪测量误差小于0.1″(计算值),从而提高了惯性平台水平测量精度。

Inertial platform coordinate system needs to be aligned with ship coordinate system during installing an inertial platform into a ship, and this can be realized by calibrating the inertial platform. When a ship is built on an inclined berth, the measurement error of leveling instrument due to the tilt angle of ship-building berth has great influence on the calibration results. In particular, the improper placement of the leveling instrument would become an error source in the measurement of ship＇s roll. To solve this problem, an optical benchmark is set on the electronic level gauges, then a high-precision auto-collimation theodolite, i.e. TM5100 A, is used to implement azimuth alignments for these gauges on benchmark platform and inertial platform to ensure the consistency of the azimuth measurements. Experimental results indicate that the azimuth alignment error is 2″, and the measurement error of level measurement is less than 0.1″, showing that the level measurement precision of inertial platform is improved.